NarrativeScience/snakegit — pull request #56 by AshtonKem (2013-02-21 23:16:09+00:00)
Title: Fix site-packages

Turns out the upgrade flag caused system installed packages to be reinstalled. Thus we should differentiate between == packages, which never need to be upgraded, and >= requirements, which might.
@turtlebender @NicholasDAllen